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Description
When adding a new PositionalVariant record using CdsPosition, a ValidationError is raised if a negative position is typed, even if the actual Schema definition for CdsPosition allows for it: https://github.com/bcgsc/pori_graphkb_schema/blob/master/src/definitions/position.ts#L69-L80
Issue linked to SDEV-2999 and KBDEV-990.